The reaction of 'GaI' with potassium cyclopentadienides allows a simple access to cyclopentadienylgallium(I)-complexes. Thus, the compounds Me5C5Ga 1 and Me4EtC5Ga 2 have been prepared in high yields. Performing the synthesis of 'GaI' under ultrasonic conditions not in toluene but in benzene as solvent, avoids the formation of benzyl iodide as side product. (C) 2002 Published by Elsevier Science B.V.